ShuriZma
/
dolphin
mirror of https://github.com/dolphin-emu/dolphin.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Fix conditional branching on x86_64. 

The register cache can be filled to the point that when dumping them the FixupBranch goes over the maximum size of 0x80.
Force them to use the "5byte" variant of the jump.

If we were able to determine if the length we had to jump was <0x80 in the future this could be a slight optimization.
This has to be done in bcctrx, bclrx, and twx. It was already done in bcx before.
This fixes issue 7378.
This commit is contained in:
Ryan Houdek 2014-06-13 12:41:50 -05:00
parent 5a66ded081
commit 2152e812fc
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Source/Core/Core/PowerPC/Jit64/Jit_Branch.cpp
View File

@ -186,7 +186,7 @@ void Jit64::bcctrx(UGeckoInstruction inst)
branch = CC_Z;
else
branch = CC_NZ;
FixupBranch b = J_CC(branch, false);
FixupBranch b = J_CC(branch, true);
MOV(32, R(EAX), M(&CTR));
AND(32, R(EAX), Imm32(0xFFFFFFFC));
//MOV(32, M(&PC), R(EAX)); => Already done in WriteExitDestInEAX()
@ -214,9 +214,9 @@ void Jit64::bclrx(UGeckoInstruction inst)
{
SUB(32, M(&CTR), Imm8(1));
if (inst.BO & BO_BRANCH_IF_CTR_0)
pCTRDontBranch = J_CC(CC_NZ);
pCTRDontBranch = J_CC(CC_NZ, true);
else
pCTRDontBranch = J_CC(CC_Z);
pCTRDontBranch = J_CC(CC_Z, true);
}
FixupBranch pConditionDontBranch;
@ -224,9 +224,9 @@ void Jit64::bclrx(UGeckoInstruction inst)
{
TEST(8, M(&PowerPC::ppcState.cr_fast[inst.BI >> 2]), Imm8(8 >> (inst.BI & 3)));
if (inst.BO & BO_BRANCH_IF_TRUE) // Conditional branch
pConditionDontBranch = J_CC(CC_Z);
pConditionDontBranch = J_CC(CC_Z, true);
else
pConditionDontBranch = J_CC(CC_NZ);
pConditionDontBranch = J_CC(CC_NZ, true);
}
// This below line can be used to prove that blr "eats flags" in practice.

2
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
View File

@ -2194,7 +2194,7 @@ void Jit64::twx(UGeckoInstruction inst)
{
if (inst.TO & (1 << i))
{
FixupBranch f = J_CC(conditions[i]);
FixupBranch f = J_CC(conditions[i], true);
fixups.push_back(f);
}
}